neilvg
Headphoneus Supremus
- Joined
- Jun 10, 2004
- Posts
- 1,585
- Likes
- 41
Hey guys,
So my Singlepower ES-2 developed a problem shortly after it arrived back from the International Meet. I don't think any of the issues had to do with its transportation, but rather something that was probably going to happen sooner or later.
The issue which has developed is the same that I originally encountered and had sent back to Mikhail. It was the delay in receiving this amp back that had originally prompted me to start: http://www.head-fi.org/forums/f5/whe...ikhail-333677/
Anyway, the issue is that the left channel went 'out'. The biasing for the left channel is uncontrollable (output and primary) and the volume is very low/almost non-existent.
I've located a high-end repairman/technician in Campbell, CA. The company is called True Sound. Thanks to foo_me for the contact.
So what Nick at True Sound will be able to do is a kind of 'Audit' so to speak of the amp. Since he will be the only other person to view the internals of this amp other than Mikhail himself, he will be able to verify from another perspective, if this amp measures up to what was originally sold to me. I have given him the original spreadsheet with all the specifications (including all the electronics, etc...).
*One question he had which I was not able to answer was about the biasing circuit in the amp. If anyone can help me with this that would be much appreciated. The amp has a built in bias meter and it has 8 buttons for measuring the bias:
Right Output (2 buttons)
Right Primary (2 buttons)
Left Output (2 buttons)
Left Primary (2 buttons)
The way I would go about biasing this amp was to press down these two buttons (primary or output for each side) and dial in the reading to as close to 000.0 as I could get. Nikongod helped me out with this at the International when I didn't have the bias display power adapter.
What Nick and I would like to know is what the reasoning is behind this. What is Primary, what is Output (on a technical level) and how is it measured. Also, why are there two buttons for each. If I hold down one, it gives me a reading sometimes but it's not right. I was told by Mikhail to hold both. It makes a scratching sound on the headphone when these buttons are pressed although as far as I know, they only read the bias, the knobs (Rt Primary. Rt Output/Lft Primary. Lft Output) still have to be turned.
Any info would be great if known.
Thanks! Hopefully Nick will be able to shed some additional light on the layout, and safety of the amp as well.
Neil
So my Singlepower ES-2 developed a problem shortly after it arrived back from the International Meet. I don't think any of the issues had to do with its transportation, but rather something that was probably going to happen sooner or later.
The issue which has developed is the same that I originally encountered and had sent back to Mikhail. It was the delay in receiving this amp back that had originally prompted me to start: http://www.head-fi.org/forums/f5/whe...ikhail-333677/
Anyway, the issue is that the left channel went 'out'. The biasing for the left channel is uncontrollable (output and primary) and the volume is very low/almost non-existent.
I've located a high-end repairman/technician in Campbell, CA. The company is called True Sound. Thanks to foo_me for the contact.
So what Nick at True Sound will be able to do is a kind of 'Audit' so to speak of the amp. Since he will be the only other person to view the internals of this amp other than Mikhail himself, he will be able to verify from another perspective, if this amp measures up to what was originally sold to me. I have given him the original spreadsheet with all the specifications (including all the electronics, etc...).
*One question he had which I was not able to answer was about the biasing circuit in the amp. If anyone can help me with this that would be much appreciated. The amp has a built in bias meter and it has 8 buttons for measuring the bias:
Right Output (2 buttons)
Right Primary (2 buttons)
Left Output (2 buttons)
Left Primary (2 buttons)
The way I would go about biasing this amp was to press down these two buttons (primary or output for each side) and dial in the reading to as close to 000.0 as I could get. Nikongod helped me out with this at the International when I didn't have the bias display power adapter.
What Nick and I would like to know is what the reasoning is behind this. What is Primary, what is Output (on a technical level) and how is it measured. Also, why are there two buttons for each. If I hold down one, it gives me a reading sometimes but it's not right. I was told by Mikhail to hold both. It makes a scratching sound on the headphone when these buttons are pressed although as far as I know, they only read the bias, the knobs (Rt Primary. Rt Output/Lft Primary. Lft Output) still have to be turned.
Any info would be great if known.
Thanks! Hopefully Nick will be able to shed some additional light on the layout, and safety of the amp as well.
Neil